I encountered a problem with my new Lumia 920: For incoming calls (and also in the call history), often only the number is shown, even if I have a contact with that number in my contacts list.
For some numbers, I could resolve this by saving the contact number again without spaces (which by itself is a joke - is it too hard for WP to see the numbers are the same when they contain spaces?!). For others, this does not work either. I press the number in the call history and "save" it again for the contact (overwriting the identical one), but still the names are not shown.

Does anyone have the same problem on their phone? Is any fix known?
This is very annoying since it's such a simple and basic thing. And I'm not really good in remembering numbers...

I have a Nokia Lumia 822 and just noticed that I no longer get reverse number to contact lookups on inbound calls. I use to see the contact with a picture but now all inbound calls just show a phone number. I tried rebooting but it still has the same behavior.

Any ideas, is this a new bug or application coexistence issue with Skype or something else?

I have this same issue, to the best of my knowledge I don't use a Hotmail connector with Outlook, not actually sure what that is. A hard reset (Volume Down+Power) does fix it, but only for a brief period. I have the following accounts on my phone:
Facebook
Gmail (no contacts, tasks, calendar, Email ONLY)
Exchange work (everything (contacts, tasks, email, calendar)
Hotmail/Live/Outlook.com (my "Windows" account)

I have this same issue, to the best of my knowledge I don't use a Hotmail connector with Outlook, not actually sure what that is.

"Hotmail connector" is a piece of software that allows you to use MS Office Outlook with Hotmail/Live/Outlook.com email accounts.

I'm still playing around and haven't completely verified it, but my suspicion is there is a file lock issue with the contacts when you use MSO Outlook with your Hotmail/Live/Outlook account. Mainly when you leave MSO Outlook running on your computer, and then your computer goes to sleep or hibernates. Then things get funky.

(There has to be a better way of differentiating the various "Outlook" names that Microsoft uses now, I think they've gone a bit overboard)

This is happening to me all the time and the reboot typically works for about 30mins before it seizes up again. I've quite a lot of contacts across a lot of networks and I'm wondering if that is causing it to choke. Its getting to the point I'm having trouble being positive about its other great features when it is failing so badly on the basics.

Same problem on my Lumia 920, do not shows names under call history only numbers, weird I did not have this problem before Nokia Amber Update, and it really start to be a issue. By the way, after some period it shows names but not for full call history. Maybe last calls (incoming/outgoing) that they made in last 30 minutes, not shows names, even for same number.
It must be some bug.

Tried various noob fixes (resets), but it only fixes the issue for about a week or two. Then it returns.

Started a similar topic on the official MS community, yet no result. People are having this issue and so far I haven't hound a solution. At first I thought it is power related i.e. the 8s lacking operative memory, but this seems not to be the case, since far more powerful devices have the same problem it seems.

I am still experiencing problem, if I have huge amount of calls in very short period, history log knows not to show them or simply not show whose call, in other words just show number. Usually, power off/on.
Maybe GDR3 preview solve this issue.
Cheers.